public string RetreiveData(byte slot)
{
string cmd = "8082" + Util.BinToHex(slot) + "0019";
string resp = Send(cmd);
if (resp.EndsWith("9000"))
{
int len = int.Parse(resp.Substring(0, 2));
string hex = resp.Substring(2, len * 2);
return Util.HexToAscii(hex);
}
else
{
return null;
}
}